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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] ISCSI: CmdSN in non-leading loginI am looking for clarification with regard the value that an initiator should put in the CmdSN field of a login request for a non-leading connection. There is a certain ambiguity about 9.12.8. The text describes how in a leading connection, the target takes must accept and use a non-zero CmdSN, but it does not explain what should be present for a non-leading connection. There are a couple of problems here for the target. At what point is a non-leading connection considered to be part of the session ? Is it the moment that the login request is received with a non-zero TSIH ? Or is it only when the non-leading login succeeds and it enters full feature phase ? So, should an initiator set the CmdSN in the first login request to zero and only synchronise with the session command stream after full feature phase is established ? This is my preferred option. What happens if the initiator tries using the current session command sequence number is that whilst the login negotiation occurs, other connections within the session can be issuing new commands, so by the time that the login is finished the CmdSN exchanged in the initial request is invalid anyway. I would like to see something along the lines that for a non-leading connection, the CmdSN field MUST be zero and that the connection can not be considered part of the session until full feature phase is entered, at which point any commands issued on the connection are now synchronised with the session command sequence number as observed by all other existing connections on the session. regards, Mark.
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